"Sublimation and Sublimation" PPT courseware on changes in the state of matter

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"Sublimation and Sublimation" PPT courseware on changes in the state of matter

1. Sublimation and sublimation

Explore: Can matter change directly from solid to gas?

Iodine sublimation and desublimation experiments

Put a small amount of iodine in the test tube and close the stopper tightly. Add hot water to the beaker and place the test tube in the beaker to heat. When the test tube is filled with a certain gas, take the test tube out and place it in cold water.

Observe carefully:

1. What state is iodine in before heating?

2. What changes occur during the heating process?

3． What did you see when you stopped heating and cooled down?

The process of a substance changing directly from a solid state to a gaseous state is called sublimation.

During the sublimation process, substances need to absorb heat.

The process of matter changing directly from gaseous state to solid state is called sublimation.

Substances need to release heat during the sublimation process.

2. Sublimation and sublimation phenomena in life

Introduction to dry ice

Dry ice is solid carbon dioxide existing at -78.5oC under one atmospheric pressure. It can directly turn into carbon dioxide gas at room temperature.

The bulb of an incandescent lamp will turn black after being used for a long time. This is because the tungsten filament is heated and produces a ( ) phenomenon, and the tungsten vapor produces a ( ) phenomenon on the wall of the bulb.

3. Water cycle in nature

Think about: How are rain, snow, clouds, fog, dew, frost, and hail formed?

summary:

Sublimation: The process by which a substance changes directly from a solid state to a gaseous state. During the sublimation process, substances need to absorb heat.

Sublimation: The process by which matter changes from gaseous state directly to solid state. Substances need to release heat during the sublimation process.

Feedback exercise:

1. The process of matter changing directly from _____ state to _____ state is called sublimation. During sublimation, _____ heat is required.

2. The process of matter changing directly from _____ state to _____ state is called sublimation. During sublimation, _____ heat is required.

3． In the cold winter of Harbin, the ice sculptures in the park will shrink day by day. This is a _____ phenomenon.

4. The frost you see in the morning in winter is water vapor in the air ( )

A. solidified

B. Directly condensed

C. liquefied

D． formed by first liquefying and then solidifying

5. Which of the following phenomena are sublimation phenomena ( )

A. Moth balls placed in wooden boxes will become smaller over time

B. In the summer morning, there is often dew on the grass

C. The water spilled on the ground has dried

D． The fresh meat in the freezer has become hard

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"Sublimation and Sublimation" Material Forms and Changes PPT Courseware 3:

"Sublimation and Sublimation" Material Forms and Changes PPT Courseware 3 Review Review 1. What are the conversion processes between solid and liquid called? Endothermic or exothermic? The change of matter from solid to liquid is called melting, which is an endothermic process. ; The change of substance from liquid to solid is called solidification..

"Sublimation and Sublimation" Material Form and Its Changes PPT Courseware 2:

"Sublimation and Sublimation" Material Forms and Changes PPT Courseware 2 Learning Objectives 1. Know what sublimation and sublimation are, and understand the phenomena of sublimation and sublimation in life 2. Know that sublimation absorbs heat and sublimation releases heat 3. I am willing to explore the phenomena of sublimation and sublimation in life and appreciate...

"Sublimation and Sublimation" Material Forms and Changes PPT Courseware:

"Sublimation and Sublimation" Material Forms and Changes PPT Courseware Teaching Objectives 1. Know what sublimation and sublimation are, and understand the phenomena of sublimation and sublimation in life. 2. Know that sublimation needs to absorb heat and sublimation needs to release heat. 3. Understand and sublimate through experiments, observation and analysis..

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Update Time: 2024-10-19

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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